Sony is not worried:
Sept was 5 weeks/Oct 4 weeks.
PS3 Sept 238k or 47.6/week
PS3 Oct 190k or 47.5/week
360 Sept 347 or 69.4/week
360 Oct 371 or 92.7/week
So... in the face of huge Xbox discounts the PS3 continued to sell at the same pace as before... maybe SONY sees this as a reason to not panic? The above numbers are a little off as it wasn't EXACTLY 5 weeks and 4 weeks but the following chart will explain:
Year over year SONY's October sales went from 121k in 2007 to 190k in 2008... this is a larger percentage year over year increase than the 360 that moved 366k in 2007 and 371k in 2008.
So..although we are seeing a short term bump in the trend for the 360... year over year the price cut has only marginally bumped sales while SONY's sales are still accelerating year over year.